Stellings "Green" headers with Gaffrig Air Mufflers.

Sweet, nice setup. I have similar motors, mine made 750hp@5500, and 800@6000. Right now I am turning 17x29 four blades to 5500, gps speeds in mid 80's. My drives are 1.5.

32's might be a bit too much for 700's in a 12 meter, unless you slip the heck out of them. I'd try some 27-28p 4 blades.


What's going on with the choke being sucked closed? I have chokes on my rear carbs, and didn't dawn on me the possibility of them being able to get sucked closed at wot

Yes some prop testing is a good idea. Props for SSM 3's aren't the eaisiest things to find though.
The electric choke was not adjusted tight enough. When in full open it was still able to be pushed closed eaisily. I think the coil spring is probably worn out. We are thinking of just removing the chokes altogether.

I hear ya on the props. My IV's have the same 19 spline shafts.

Ran yesterday, nice chop, got 88mph out of her on gps.

Great numbers Mild Thunder! I think you've got your beak dialed in. Sure hope I can break into the 80's with my setup. Can't wait to get out for some more testing. The previous owner claimed 84 with with 700 NA HP and the same props I'm running. I guess I'll just have to wait and see.